1what do strong acids and strong bases have in common?
a they both partially dissociate, with reverse reactions occurring.
b they both dissociate completely, with little or no reverse reactions.
c they both remain intact when placed in water, with no dissociation taking place.
d they both dissociate completely, with reverse reactions constantly taking place.
2 what happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?
a matter changes to a solid state.
b matter changes to a liquid state.
c matter changes to a plasma state.
d matter changes to a gaseous state.
3 consider a balloon that has a volume v. it contains n moles of gas, it has an internal pressure of p, and its temperature is t. if the balloon is heated to a temperature of 15.5t while it is placed under a high pressure of 15.5p, how does the volume of the balloon change?
a it doubles.
b it stays the same.
c it increases greatly.
d it decreases slightly.

1) Answer is: B They both dissociate completely, with little or no reverse reactions.

Some of strong acids: HNO₃(nitric acid), HCl(hydrochloric acid), H₂SO₄(sulfuric acid), HI(hydroiodic acid). Strong bases are: sodium hydroxide (NaOH), barium hydroxide (Ba(OH)₂).

For example, hydrochloric acid, completely dissociate in water and give large amount of hydrogen ions (H⁺): HCl(aq) → H⁺(aq) + Cl⁻(aq).

Sodium hydroxide completely dissociate in water:

NaOH(aq) → Na⁺(aq) + OH⁻(aq).

2) Answer is: C Matter changes to a plasma state.

Plasma is a an ionised gas with highly electrical conductivity.

In solid, molecules are closely packed, stiff and do not changes of shape or volume. Solid object (for example iron) does not take on the shape of its container.  

Liquids have definite volume, but no fixed shape.  

Gases (for example nitrogen and neon) not have definite volume and fixed shape, it depends on its container.  

3) Answer is: B It stays the same.

p₁ = P; initial pressure.

p₂ = 15.5 P; final pressure.

V₁ = V: initial volume.

V₂ = ?: final volume.

T₁ = T; initial temperature.

T₂ = 15.5T; final temperature.

The combinated gas law: The volume of a given amount of gas is proportional to the ratio of its Kelvin temperature and its pressure: p₁·V₁/T₁ = p₂·V₂/T₂.

P·V/T = (15.5P · V₂) / 15.5 T.

V₂ = V₁ = V.

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.